Modeling of inundation dynamics on Banda Aceh,Indonesia during the great Sumatra tsunamis December 26, 2004 |
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| Authors: | Gegar Prasetya Jose Borrero Willem de Lange Kerry Black Terry Healy |
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| Institution: | (1) Coastal Marine Group, Department of Earth and Ocean Sciences, University of Waikato, Hamilton, New Zealand;(2) ASR Ltd, Marine Consulting and Research, Raglan, New Zealand |
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| Abstract: | The tsunami inundation flows on Banda Aceh, Indonesia reached 5 km inland during the December 26, 2004, event and devastated
most of the houses, buildings, and infrastructure along the coast and killed more than 167,000 people. The overland flows
from the northwest coast and the west coast collided at Lampisang village approximately 3.7 km from Ulee Lheue (northwest
coast) and 6.8 km from Lhok Nga (west coast) as reported by survivors. Inundation modeling based on the nonlinear shallow-water
wave equations reproduces the inundation pattern and demonstrates a colliding of the overland flows. The model suggests that
wave characteristics on the northwest coast of Banda Aceh were different from those on the waves that impacted upon the west
coast. The areas, which experienced higher inundation levels, did not always experience greatest overland flow speeds, and
the damage areas mostly coincide with the flow speed distribution rather than the runup and inundation depth. |
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